| ANS | acanthion; American Nutrition Society; 8-anilino-1-naphthalene-sulfonic acid; anterior nasal spine; ... |
|---|---|
| APS | adenosine phosphosulfate; American Pain Society; American Pediatric Society; American Physiological ... |
| ARAMIS | American Rheumatism Association Medical Information System |
| ARAS | ascending reticular activating system |
| ARSM | acute respiratory system malfunction |